Porous BPPO-based membranes modified by multisilicon copolymer for application in diffusion dialysis

• Published in: Journal of membrane science Vol. 450; pp. 103 - 110
• Main Authors: Sun, Fujian, Wu, Cuiming, Wu, Yonghui, Xu, Tongwen
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.01.2014; Elsevier
• Subjects: Acid recovery; Applied sciences; BPPO; Chemistry; Colloidal state and disperse state; Copolymers; Diffusion; Diffusion dialysis (DD); Exact sciences and technology; Exchange resins and membranes; Flux; Forms of application and semi-finished materials; General and physical chemistry; Hydrolysis; Membranes; Multisilicon copolymer; Oxides; Phase inversion; Polymer industry, paints, wood; Swelling; Technology of polymers; Phase inversion; Acid recovery; Multisilicon copolymer; BPPO; Diffusion dialysis (DD); Polymeric membrane; Acids; Porous membrane; Dialysis; Copolymer; Diffusion; Recovery
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2013.08.046

Brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO)-based hybrid membranes are produced from phase inversion, partial hydrolysis, modification with multisilicon copolymer of poly(MA-co-γ-MPS) and quaternization processes. The membranes have a porous structure, as revealed by SEM observation and water flux measurement. The modification by poly(MA-co-γ-MPS) introduces 3Si3O3Si network in the BPPO matrix, and hence the membrane swelling resistance in 65°C water is enhanced. The membranes are taken for diffusion dialysis (DD) process to recover HCl from HCl/FeCl2 solution. The dialysis coefficients of HCl (UH) are in the range of 0.020–0.025m/h at 25°C and the separation factor (S) can reach up to 45.5. The high permeability and selectivity are due to the unique membrane structure and the presence of different functional groups. •Micro-porous membranes from phase inversion are tried for DD.•The membranes show both high permeability and selectivity.•UH are 0.020–0.025m/h at 25°C and S can reach up to 45.5.•Membrane structure and functional groups determine synthetically DD performances.